"Lance Armstrong's heart, like that of many other athletes, is thought to be 30% larger than average.
"He had a resting heart rate of 32-34 beats per minute (the average for males is 70 and 75 for women) - a trained athlete's resting heart rate is lower because it pumps more blood per beat than an untrained person's does."

"The answer to the length of life turned out to be the faster the heartbeat, the shorter the life, the slower the heartbeat, the longer the life. The pattern discovered is that in general all amphibians, birds, fish, mammals and reptiles have roughly a billion beats per lifetime. Whales’ heartbeats average 10-15 a minute, even slower while diving, shrews 850 beats a minute, even faster to 1,500 when frightened. Human’s hearts beat at around 70 a minute. That means humans shouldn’t be living past young adulthood. The reason humans are the sole exception to the rule is our big brains that have figured out how to bend the rules."